Intro to Psych is the course that the other two build on--the foundation course. That would probably be my first choice. However, you can certainly take either of the other two tests without having ever taken Intro Psych. If I had to take one of the other two my vote would be for HG& Dev, as well. I don't usually use IC as my only source-- but some people do go that route. I usually use the IC flashcards, Wiki, a used textbook from Amazon, YouTube, ITunes University etc.--- I try to get additional info wherever I can
Also, I would highly recommend that you do the free Peterson Practice tests. These are invaluable to let you know how prepared you are for the real test. What you score on these is pretty good indicator of what you will do on the real test. Go to this website At the top of the page it says Practice Clep Tests-- click on that and it will show you where to get them free. This website also has other advice about how difficult the tests are, what other resources to use to study etc etc. After you study for awhile take the Peterson's and that will give you a good idea of how ready you are for the real thing. They are also a good study tool because they give you the rationale behind the correct answers. Best wishes on your test!!
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